"grub2 contains a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing."
Defining a new function with the same name as a previously defined function causes the grub_script and associated resources for the previous function to be freed. If the previous function is currently executing when a function with the same name is defined, this results in use-after-frees when processing subsequent commands in the original function.
Acknowledgments: Name: Chris Coulson (Canonical)
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:3216 https://access.redhat.com/errata/RHSA-2020:3216
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-15706
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:3217 https://access.redhat.com/errata/RHSA-2020:3217
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2020:3223 https://access.redhat.com/errata/RHSA-2020:3223
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions Via RHSA-2020:3227 https://access.redhat.com/errata/RHSA-2020:3227
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.2 Advanced Update Support Via RHSA-2020:3273 https://access.redhat.com/errata/RHSA-2020:3273
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Advanced Update Support Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions Red Hat Enterprise Linux 7.4 Telco Extended Update Support Via RHSA-2020:3275 https://access.redhat.com/errata/RHSA-2020:3275
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.6 Extended Update Support Via RHSA-2020:3271 https://access.redhat.com/errata/RHSA-2020:3271
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.3 Advanced Update Support Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions Red Hat Enterprise Linux 7.3 Telco Extended Update Support Via RHSA-2020:3276 https://access.redhat.com/errata/RHSA-2020:3276
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.7 Extended Update Support Via RHSA-2020:3274 https://access.redhat.com/errata/RHSA-2020:3274
Created grub2 tracking bugs for this issue: Affects: fedora-all [bug 1863023]